xxyy, xyy, xxx, xxy, and x are actually things but are not genders or separate sexes. They are chromosomal abnormalities like down syndrome and some can have really bad effects on those that have them. Just having one x chromosome is called Turner syndrome and usually leads to shorter life spans due to health problems.

You are referring to people that are intersex. They aren't a separate sex, but usually a result of a developmental error in the womb, there are cases known as somatic mosaicism which is caused when a Y chromosome is over written by a X chromosome during development causing the child to have both female and male cells in their body, this may also cause some cells to have Turner syndrome in females as they may lose an x chromosome.

Gender is a form of human classification / categorization system. Male and Female are the most predominant category based on easily observable consistent physical characteristic features. However, we now know that looks can be deceiving. So modern classification incorporates new understand of heredity based on XX and XY chromosomes to extend the consistency of female/male classification. So why are people still confused? Turns out you can look like a female or male with either XX and XY chromosomes, even though the majority of people who have XX will look like female and majority of XY will look like male. So where does the exception to look like any category comes in?

okay the following part I got tired of traditional explanation so I'll add some flavor to it.
The exception comes in when god makes a mistake in his programming language. XX was a program to make a female and XY was that to make a male. God, was a little drunk when he was coding and he either forgot to include some routines or that he just over does it. Essentially, the phenotype expression (the output of his program) get either too much, too little or in between "female" / "male" look. E.g. The guy with girlie look, the girl with manly look, the guy with watermelons, and the girl with birdy etc. In the extreme sense - severe disfigurement are usually misunderstood by society.

So you can see the confusion with the physical male/female and biological classification put your understanding to the test. And you thought your wife/husband was a female/male
So what about XXX? I thought that was porno so I won't go into it. haha.. But you read up on it, if not view it.

What about LGBT? Oh god, what have you been drinking? (I'll bet he'd say: apple cider)
Well of course, if my translation of god's work make any sense, continue to be entertained (Don't kill the messenger)
LGBT are probably a group of people who feel that they don't into belong into the female/male category/gender.
Shall we have a new gender or category?
As limited as my understand goes...Some say LGBT classification is based on gender identification. I thought it was based on rigid neurological association of attraction on a particular gender. e.g. you like a guy, girl, or both. (okay lets not get political on the terms)
Of course that can be a bit broad...because some wise guy/gal gonna say...what if...what if this neurologic association was to a non-human gender?
I tried to ask god that, but had no response. So he's probably saying something like - stop mocking me with the silly questions and learn to appreciate my creation

Plenty of species can essentially clone themselves or only consist of 1 gender.

That does not make what I wrote above incorrect.

List 1 that has 3 genders.

[Slur word and sentiment removed by mod].

If talking about gender roles and identity and not just sexual reproduction function, then transgender people may count. Some cultures do recognize gender roles and identities aside from binary male or female.

BTW, in case you didn't know, "tranny" is basically a slur word. It might be used comfortably among transgender people themselves, but in the context you used it, it came across as disrespectful.

You are referring to people that are intersex. They aren't a separate sex, but usually a result of a developmental error in the womb, there are cases known as somatic mosaicism which is caused when a Y chromosome is over written by a X chromosome during development causing the child to have both female and male cells in their body, this may also cause some cells to have Turner syndrome in females as they may lose an x chromosome.

Are those with intersex cannot reproduce? From my Google search it is possible, please don't find this offensive. I am just tracing back the evolutionary chain as to why we only have two genders

Plenty of species can essentially clone themselves or only consist of 1 gender.

That does not make what I wrote above incorrect.

List 1 that has 3 genders.

[Slur word and sentiment removed by mod].

If talking about gender roles and identity and not just sexual reproduction function, then transgender people may count. Some cultures do recognize gender roles and identities aside from binary male or female.

BTW, in case you didn't know, "tranny" is basically a slur word. It might be used comfortably among transgender people themselves, but in the context you used it, it came across as disrespectful.

I'm questioning why do you think there is 3 or more genders, for humans there is only 2 GENDERS. So people who wanna feel special in your world of imagination do so, but in the real world there is only 2 GENDERS (For Humans) For all I know.

Also please...God made it this way? People, this is the worst argument you can give regardless of what you think lol. God is a human invention.

how is a penis and vagina cultural? There is only man and woman, its a biology thing.

A penis and a vagina aren't cultural that's for sure. The terms male and female sure are thought. That how we identify in our society. Society could create a 3rd, a 4th and a 5th qualifier if they wanted to.